Should I block him?

Since seeing pictures of him and his girlfriend currently on holiday together I don’t find him all that attractive anymore. I don’t want to come in between a man who has a girlfriend even tho we have kissed in the past and told each other we fancied each other. He said he has some growing up to do before he moves forward with me as his only 20. If there might be something there in the future I really don’t know? I now feel i should block him on social media because he likes my posts and for some reason it gives me anxiety knowing his on there. My only concern is could it cause issues because his my brothers best friend and my brother doesn’t know anything about this as we said we would keep it between us and we do see each other here and there?

Should I block him?
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